27891765072 has 40 divisors (see below), whose sum is σ = 80059697280. Its totient is φ = 9297254880.

The previous prime is 27891765061. The next prime is 27891765119. The reversal of 27891765072 is 27056719872.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32281704 + ... + 32282567.

It is an arithmetic number, because the mean of its divisors is an integer number (2001492432).

Almost surely, 2^27891765072 is an apocalyptic number.

It is an amenable number.

27891765072 is an abundant number, since it is smaller than the sum of its proper divisors (52167932208).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27891765072 is a wasteful number, since it uses less digits than its factorization.

27891765072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64564288 (or 64564276 counting only the distinct ones).

The product of its (nonzero) digits is 2963520, while the sum is 54.

The spelling of 27891765072 in words is "twenty-seven billion, eight hundred ninety-one million, seven hundred sixty-five thousand, seventy-two".